#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/kgdb.h>
+#include <linux/kdb.h>
#include <linux/tty.h>
#define MAX_CONFIG_LEN 40
static struct tty_driver *kgdb_tty_driver;
static int kgdb_tty_line;
+#ifdef CONFIG_KDB_KEYBOARD
+static int kgdboc_register_kbd(char **cptr)
+{
+ if (strncmp(*cptr, "kbd", 3) == 0) {
+ if (kdb_poll_idx < KDB_POLL_FUNC_MAX) {
+ kdb_poll_funcs[kdb_poll_idx] = kdb_get_kbd_char;
+ kdb_poll_idx++;
+ if (cptr[0][3] == ',')
+ *cptr += 4;
+ else
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void kgdboc_unregister_kbd(void)
+{
+ int i;
+
+ for (i = 0; i < kdb_poll_idx; i++) {
+ if (kdb_poll_funcs[i] == kdb_get_kbd_char) {
+ kdb_poll_idx--;
+ kdb_poll_funcs[i] = kdb_poll_funcs[kdb_poll_idx];
+ kdb_poll_funcs[kdb_poll_idx] = NULL;
+ i--;
+ }
+ }
+}
+#else /* ! CONFIG_KDB_KEYBOARD */
+#define kgdboc_register_kbd(x) 0
+#define kgdboc_unregister_kbd()
+#endif /* ! CONFIG_KDB_KEYBOARD */
+
static int kgdboc_option_setup(char *opt)
{
if (strlen(opt) > MAX_CONFIG_LEN) {
__setup("kgdboc=", kgdboc_option_setup);
+static void cleanup_kgdboc(void)
+{
+ kgdboc_unregister_kbd();
+ if (configured == 1)
+ kgdb_unregister_io_module(&kgdboc_io_ops);
+}
+
static int configure_kgdboc(void)
{
struct tty_driver *p;
int tty_line = 0;
int err;
+ char *cptr = config;
err = kgdboc_option_setup(config);
if (err || !strlen(config) || isspace(config[0]))
goto noconfig;
err = -ENODEV;
+ kgdb_tty_driver = NULL;
+
+ if (kgdboc_register_kbd(&cptr))
+ goto do_register;
- p = tty_find_polling_driver(config, &tty_line);
+ p = tty_find_polling_driver(cptr, &tty_line);
if (!p)
goto noconfig;
kgdb_tty_driver = p;
kgdb_tty_line = tty_line;
+do_register:
err = kgdb_register_io_module(&kgdboc_io_ops);
if (err)
goto noconfig;
noconfig:
config[0] = 0;
configured = 0;
+ cleanup_kgdboc();
return err;
}
return configure_kgdboc();
}
-static void cleanup_kgdboc(void)
-{
- if (configured == 1)
- kgdb_unregister_io_module(&kgdboc_io_ops);
-}
-
static int kgdboc_get_char(void)
{
+ if (!kgdb_tty_driver)
+ return -1;
return kgdb_tty_driver->ops->poll_get_char(kgdb_tty_driver,
kgdb_tty_line);
}
static void kgdboc_put_char(u8 chr)
{
+ if (!kgdb_tty_driver)
+ return;
kgdb_tty_driver->ops->poll_put_char(kgdb_tty_driver,
kgdb_tty_line, chr);
}
--- /dev/null
+/*
+ * Kernel Debugger Architecture Dependent Console I/O handler
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.
+ *
+ * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/kdb.h>
+#include <linux/keyboard.h>
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+/* Keyboard Controller Registers on normal PCs. */
+
+#define KBD_STATUS_REG 0x64 /* Status register (R) */
+#define KBD_DATA_REG 0x60 /* Keyboard data register (R/W) */
+
+/* Status Register Bits */
+
+#define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */
+#define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */
+
+static int kbd_exists;
+
+/*
+ * Check if the keyboard controller has a keypress for us.
+ * Some parts (Enter Release, LED change) are still blocking polled here,
+ * but hopefully they are all short.
+ */
+int kdb_get_kbd_char(void)
+{
+ int scancode, scanstatus;
+ static int shift_lock; /* CAPS LOCK state (0-off, 1-on) */
+ static int shift_key; /* Shift next keypress */
+ static int ctrl_key;
+ u_short keychar;
+
+ if (KDB_FLAG(NO_I8042) || KDB_FLAG(NO_VT_CONSOLE) ||
+ (inb(KBD_STATUS_REG) == 0xff && inb(KBD_DATA_REG) == 0xff)) {
+ kbd_exists = 0;
+ return -1;
+ }
+ kbd_exists = 1;
+
+ if ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
+ return -1;
+
+ /*
+ * Fetch the scancode
+ */
+ scancode = inb(KBD_DATA_REG);
+ scanstatus = inb(KBD_STATUS_REG);
+
+ /*
+ * Ignore mouse events.
+ */
+ if (scanstatus & KBD_STAT_MOUSE_OBF)
+ return -1;
+
+ /*
+ * Ignore release, trigger on make
+ * (except for shift keys, where we want to
+ * keep the shift state so long as the key is
+ * held down).
+ */
+
+ if (((scancode&0x7f) == 0x2a) || ((scancode&0x7f) == 0x36)) {
+ /*
+ * Next key may use shift table
+ */
+ if ((scancode & 0x80) == 0)
+ shift_key = 1;
+ else
+ shift_key = 0;
+ return -1;
+ }
+
+ if ((scancode&0x7f) == 0x1d) {
+ /*
+ * Left ctrl key
+ */
+ if ((scancode & 0x80) == 0)
+ ctrl_key = 1;
+ else
+ ctrl_key = 0;
+ return -1;
+ }
+
+ if ((scancode & 0x80) != 0)
+ return -1;
+
+ scancode &= 0x7f;
+
+ /*
+ * Translate scancode
+ */
+
+ if (scancode == 0x3a) {
+ /*
+ * Toggle caps lock
+ */
+ shift_lock ^= 1;
+
+#ifdef KDB_BLINK_LED
+ kdb_toggleled(0x4);
+#endif
+ return -1;
+ }
+
+ if (scancode == 0x0e) {
+ /*
+ * Backspace
+ */
+ return 8;
+ }
+
+ /* Special Key */
+ switch (scancode) {
+ case 0xF: /* Tab */
+ return 9;
+ case 0x53: /* Del */
+ return 4;
+ case 0x47: /* Home */
+ return 1;
+ case 0x4F: /* End */
+ return 5;
+ case 0x4B: /* Left */
+ return 2;
+ case 0x48: /* Up */
+ return 16;
+ case 0x50: /* Down */
+ return 14;
+ case 0x4D: /* Right */
+ return 6;
+ }
+
+ if (scancode == 0xe0)
+ return -1;
+
+ /*
+ * For Japanese 86/106 keyboards
+ * See comment in drivers/char/pc_keyb.c.
+ * - Masahiro Adegawa
+ */
+ if (scancode == 0x73)
+ scancode = 0x59;
+ else if (scancode == 0x7d)
+ scancode = 0x7c;
+
+ if (!shift_lock && !shift_key && !ctrl_key) {
+ keychar = plain_map[scancode];
+ } else if ((shift_lock || shift_key) && key_maps[1]) {
+ keychar = key_maps[1][scancode];
+ } else if (ctrl_key && key_maps[4]) {
+ keychar = key_maps[4][scancode];
+ } else {
+ keychar = 0x0020;
+ kdb_printf("Unknown state/scancode (%d)\n", scancode);
+ }
+ keychar &= 0x0fff;
+ if (keychar == '\t')
+ keychar = ' ';
+ switch (KTYP(keychar)) {
+ case KT_LETTER:
+ case KT_LATIN:
+ if (isprint(keychar))
+ break; /* printable characters */
+ /* drop through */
+ case KT_SPEC:
+ if (keychar == K_ENTER)
+ break;
+ /* drop through */
+ default:
+ return -1; /* ignore unprintables */
+ }
+
+ if ((scancode & 0x7f) == 0x1c) {
+ /*
+ * enter key. All done. Absorb the release scancode.
+ */
+ while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
+ ;
+
+ /*
+ * Fetch the scancode
+ */
+ scancode = inb(KBD_DATA_REG);
+ scanstatus = inb(KBD_STATUS_REG);
+
+ while (scanstatus & KBD_STAT_MOUSE_OBF) {
+ scancode = inb(KBD_DATA_REG);
+ scanstatus = inb(KBD_STATUS_REG);
+ }
+
+ if (scancode != 0x9c) {
+ /*
+ * Wasn't an enter-release, why not?
+ */
+ kdb_printf("kdb: expected enter got 0x%x status 0x%x\n",
+ scancode, scanstatus);
+ }
+
+ return 13;
+ }
+
+ return keychar & 0xff;
+}
+EXPORT_SYMBOL_GPL(kdb_get_kbd_char);
projects / openwrt / staging / blogic.git / commitdiff